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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "illusions/illusions.h"
#include "illusions/scriptstack.h"
namespace Illusions {
// ScriptStack
ScriptStack::ScriptStack() {
clear();
}
void ScriptStack::clear() {
for (uint i = 0; i < 256; ++i)
_stack[i] = (int16)0xEEEE;
_stackPos = 256;
}
void ScriptStack::push(int16 value) {
--_stackPos;
if (_stackPos > 0)
_stack[_stackPos] = value;
}
int16 ScriptStack::pop() {
int16 value = 0;
if (_stackPos < 256) {
value = _stack[_stackPos];
_stack[_stackPos] = (int16)0xEEEE;
++_stackPos;
}
return value;
}
int16 ScriptStack::peek() {
int16 value = 0;
if (_stackPos < 256)
value = _stack[_stackPos];
return value;
}
int16 *ScriptStack::topPtr() {
return &_stack[_stackPos];
}
} // End of namespace Illusions
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